Yak 18T Flight Operations Manual
Page 38 of 82
Disclaimer: This manual is to be used as a reference only, it is based on translated Yak 18T Flight Operations
Manuals and has not been approved by the Yakovlev Design Bureau or any other authority.
• This enables us to maintain a UNIFORM load on the main undercarriage wheels and to
PREVENT banking during the take-off run
• A trend to the upwind turn should be COMPENSATED by sufficient rudder deflection
• As the speed increases and the aileron rolling power gets stronger, the yoke is gradually
pulled to the NEUTRAL position so as to PREVENT the aircraft lifting on one wheel and
placing undue stress on the other undercarriage leg
• When an IAS of 100km/h has been achieved, as above, by a smooth pulling of the yoke
backwards, lift the front wheel to take-off position. The crosswind take-off speed MUST
be 5-10km/h HIGHER than that of a usual take-off
• The direction after rotation and while climbing is kept by following your PLANNED flight
course
• NOTE: observe the cross-wind limitations
of this aircraft
7.4. Climbing
To prevent the engine from overheating, after you have achieved circuit height, perform the
rest of the climb at the Nominal II regime with the engine SET at 70% and IAS at –
• 170km/h at ambient air temperature up to 20°C
• 180km/h at ambient air temperature over +20°C
While climbing -
• TAKE the load off the yoke by using the trimmer and check readings of the engine
instruments
• CONSTANTLY observe the engine temperatures and that they fall within the
recommended limits -
Crankshaft rational speed 70% (Nominal I)
Petrol pressure 0.2-0.5 kgf/cm²
Engine inlet oil temperature engine inlet oil temperature 50°C-65°C (maximum oil
temperature 75°C, maximum allowable temperature during a
long-term engine operation or not more than 15 minutes is
85°C)
Oil pressure 4-6 kgf/cm²
Cylinder head temperature cylinder head temperature 140°C-190°C (maximum cylinder
head temperature during continuous engine operation is
220°C)
Carburettor inlet air temperature ≥ +10°C
Climbing from 3000m can be performed in the Nominal I regime with an IAS of 165km/h
7.5. Engine Overheating (During the Climb)
If, while climbing, the temperature regime of the engine EXCEEDS the permissible limits with
the cowling gills and the radiator shutters fully OPEN, the pilot should CEASE to climb, level
out and increase the flight speed to REDUCE the severity of the engine conditions.
To DECELERATE the engine, first reduce the boost pressure using the thrust lever and then
REDUCE the engine speed rpm using the propeller pitch lever. If the measures taken do not
result in the temperature reduction, the pilot should plan to END THE FLIGHT and INFORM
ATC of the conditions and depending on the actual situation, land at the planned alternate
airfield.
WARNINGS
• Deliberate flights into known icing conditions are PROHIBITED. If the aircraft enters
into an icing zone, the pilot must SWITCH on the CARBURETTOR HEATING, CABIN
HEATING, CLOCK and change direction and/or the flight altitude
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